Floating means that the potential or circuit is floating (away from) the ground potential. Originally, the word "float" indicated that an object floats on water or air. Therefore, it is called "floating ground" in reference to the floating potential and circuits.
A floating power supply can be used with the output floating off of the ground. In general, when using a DC power supply, one of the output ends must be grounded.
Using a floating power supply, the input and output sides have a high Galvanic isolation voltage, so another power supply output can be connected to the other output end without using the ground. Such a method is called a non-grounding link method (floating power supply), and isolation transformers are used for high withstand voltage.
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